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I have fixed this issue. The -s or --casesensitive flag has been extended to cover this issue. When the flag is set the case-sensitivity of the tags are maintained, else they are all converted into pure lower case.

The main difference between previous approaches and this one is that the 'unknown' directories would not be in upper-case, but in lower-case. After all block characters do not seem to fit in with UNIX culture!

Optimize the script by eliminating the case sensitivity. The same tag with different case sensitivity are placed on to different folders. Try to eliminate this by converting all the tags to lower case.
Eg: The tags of Album Korn are aranged in various folders korn, Korn, KoRn and KORN.
So the tag korn or Korn would be better.